Blar i UiS Brage på forfatter "Hemmingsen, Tor"

Viser treff 1-13 av 13

    • Baseline design of a subsea shuttle tanker system for liquid carbon dioxide transportation 

      Ma, Yucong; Xing, Yihan; Ong, Muk Chen; Hemmingsen, Tor (Peer reviewed; Journal article, 2021-10)
      This paper presents the baseline design of a 34,000-tonne subsea shuttle tanker (SST). The SST is proposed as an alternative to subsea pipelines and surface tankers for the transportation of liquid carbon dioxide (CO2) ...

    • Effect of hydrogen on mechanical properties and fracture of martensitic carbon steel under quenched and tempered conditions 

      Adasooriya, Mudiyan Nirosha Damayanthi; Tucho, Wakshum Mekonnen; Holm, Erlend; Årthun, Terje; Hansen, Vidar; Solheim, Karl Gunnar; Hemmingsen, Tor (Peer reviewed; Journal article, 2020)
      The change in the mechanical properties of tempered high strength carbon steel (AISI 4130) due to hydrogen embrittlement (HE) has been investigated using slow strain rate tensile tests (SSRT). The heat treatment processes ...

    • The effect of volatile organic acids and CO2 on the corrosion rate of carbon steel from a Top-of-Line-Corrosion (TLC) perspective 

      Gjertsen, Sondre Borg; Palencsar, Attila; Seiersten, Marion; Hemmingsen, Tor (Peer reviewed; Journal article, 2021)
      Models for predicting top-of-line corrosion (TLC) rates on carbon steels are important tools for cost-effectively designing and operating natural gas transportation pipelines. The work presented in this paper is aimed to ...

    • Environment-assisted fatigue of steel bridges: A conceptual framework for life assessment 

      Sandviknes, Julie Sofie Stav; Adasooriya, Mudiyan Nirosha Damayanthi; Pavlou, Dimitrios; Hemmingsen, Tor (Peer reviewed; Journal article, 2021)
      This paper presents a framework based on a recently proposed fatigue strength curve of corroded steel to assess the life of an existing steel bridge exposed to environment-assisted fatigue. Environment-assisted cracking ...

    • Fatigue strength degradation of corroded structural details: A formula for S‐N curve 

      Adasooriya, Mudiyan Nirosha Damayanthi; Pavlou, Dimitrios; Hemmingsen, Tor (Peer reviewed; Journal article, 2019)
      A formula is proposed to predict fatigue strength of corroded members and joints of steel structures. The concept of the formula is first studied from recently identified mechanism of corrosion fatigue. Hence, the corresponding ...

    • Fatigue strength degradation of metals in corrosive environments 

      Adasooriya, Mudiyan Nirosha Damayanthi; Hemmingsen, Tor; Pavlou, Dimitrios (Journal article; Peer reviewed, 2017)
      Structures exposed to aggressive environmental conditions are often subjected to time-dependent loss of coating and loss of material due to corrosion; this causes reduction in the cross-sectional properties of the members, ...

    • Multi-functional oilfield production chemicals: maleic-based polymers for gas hydrate and corrosion inhibition 

      Kelland, Malcolm Andrew; Pomicpic, Janronel Calog; Ghosh, Radhakanta; Undheim, Camilla; Hemmingsen, Tor; Zhang, Qian; Varfolomeev, Mikhail A.; Pavelyev, Roman S.; Vinogradova, Svetlana S. (Peer reviewed; Journal article, 2021)
      Several chemical problems can occur during the production of oil and gas through flow lines. This includes corrosion, scale deposition and gas hydrate plugging. Three separate chemicals may be needed to treat these issues. ...

    • Nitrogen doped Carbon Nanotubes as Electrocatalyst for Oxygen Reduction Reaction 

      Dotel, Utsav Raj; Davodi, Fatemeh; Sorsa, Olli; Kallio, Tanja; Hemmingsen, Tor (Peer reviewed; Journal article, 2019)
      The oxygen reduction reaction on nitrogen doped multiwalled carbon nanotubes (N-MCNTs) is studied for its application for deoxygenation of seawater. N-MCNTs were synthesized using commercial MCNTs and polyaniline as nitrogen ...

    • Research of the influence of marine residual fuel composition on sedimentation due to incompatibility 

      Sultanbekov, Radel; Islamov, Shamil; Mardashov, Dmitry; Beloglazov, Ilia; Hemmingsen, Tor (Peer reviewed; Journal article, 2021)
      The article shows studies of the problem of active sediment formation during mixing of residual fuels, caused by the manifestation of incompatibility. To preserve the quality and reduce sediment formation during transshipment, ...

    • S-N curve for riveted details in corrosive environment and its application to a bridge 

      Adasooriya, Mudiyan Nirosha Damayanthi; Hemmingsen, Tor; Pavlou, Dimitrios (Peer reviewed; Journal article, 2020-01)
      A formula for stress‐life curve is proposed to predict the fatigue life of riveted bridges located in corrosive environments. The corrosive environment‐dependent parameters of the S‐N curve are determined based on the ...

    • Structural Integrity of Steel Bridges: Environment-Assisted Cracking 

      Adasooriya, Niroosha D. (PhD thesis UiS;, Doctoral thesis, 2020-04)
      Steel bridges are generally subjected to degradation due to corrosive environments. Uniform corrosion, pitting corrosion, crevice corrosion, intergranular corrosion, microbiologically influenced corrosion and environment-assisted ...

    • Suitability Analysis of Implementing a Fuel Cell on a Multirotor Drone 

      Apeland, Jørgen; Pavlou, Dimitrios; Hemmingsen, Tor (Peer reviewed; Journal article, 2020-05)
      Increased flight time of multirotor drones is a key enabler for further adoption and industrial use of drones. A model for analyzing the performance of a fuel cell hybrid system for a multirotor drone is presented and ...

    • Use of Fuel Cells to Extend Multirotor Drone Endurance 

      Apeland, Jørgen (PhD thesis UiS;, Doctoral thesis, 2021-10)
      Unmanned aerial systems can be used for a range of industrial applications to reduce risk, cost, and time. Fuel cell-based propulsion systems are outlined as a solution to extend mission endurance, one of the current main ...